THE OXIDATION PROPERTIES OF IRON - NICKEL ALLOYS IN CARBON DIOXIDE - CARBON MONOXIDE ATMOSPHERES AT 1000°C

Abstract

<p>In this thesis, the results of oxidation tests carried out on iron- nickel alloys in carbon dioxide - carbon monoxide atmospheres at 1000°C are presented. Linear oxidation kinetics were observed for the formation of wustite on alloys containing up to 50 weight % nickel. Spinel oxides appear on alloys containing greater than 50 % nickel. A subscale developed in all alloys investigated. An oxidation model is presented for the constant uptake of oxygen based on detailed balancing of the individual reaction steps, assuming that dissociation of carbon dioxide is the rate controlling process. The subscale formation mechanism is based on the principles of diffusion in multicomponent metallic systems. Theoretical relationships are presented which adequately account for the experimental observations.</p>